Question 11 : The function of guide vanes in a reaction turbine is to
1. allow the water to flow over them, without forming eddies
2. all of the above
3. allow the water to enter the runner without shock
4. allow the required quantity of water to enter the turbine
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Question 12 : Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?
1. Kaplan turbine
2. none of these
3. Pelton wheel
4. Francis turbine
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Question 13 : The jet ratio is defined as the ratio of the
1. velocity of jet to the velocity of Pelton wheel
2. diameter of jet to the diameter of Pelton wheel
3. diameter of Pelton wheel to the diameter of jet
4. velocity of Pelton wheel to the velocity of jet
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Question 14 : A hydraulic press is a device used
1. to lift larger load by the application of a comparatively much smaller force
2. to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure
3. to store pressure energy which may be supplied to a machine later on
4. all of the above
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Question 15 : Which of the following pump is suitable for small discharge and high heads?
1. Axial flow pump
2. Mixed flow pump
3. Centrifugal pump
4. Reciprocating pump
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Question 16 : In an outward flow reaction turbine
1. the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
2. the water enters the wheel at the outer periphery and then flows towards the centre of the wheel
3. the flow of water is partly radial and partly axial
4. the water flows parallel to the axis of the wheel
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Question 17 : The flow ratio in case of Francis turbine varies from
1. 0.15 to 0.3
2. 0.4 to 0.5
3. 0.6 to 0.9
4. 1 to 5
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Question 18 : A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used ?
1. Pelton wheel with one nozzle
2. Pelton wheel with two or more nozzles
3. Kaplan turbine
4. Francis turbine
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Question 19 : If the ratio of all the corresponding linear dimensions are equal, then the model and the prototype are said to have
1. kinematic similarity
2. geometric similarity
3. dynamic similarity
4. none of these
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Question 20 : The undershot water wheels are those in which
1. the wheel runs partly by the weight of water and partly by the impulse of water
2. the wheel runs entirely by the impulse of water
3. the wheel runs entirely by the weight of water
4. none of the above
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